Which statement about IP telephony authorization is correct?

Which statement about IP telephony authorization is correct?

• A. Cisco is the only company authorized to modify, control and monitor IP telephony.
• B. Several vendors may modify, control and monitor IP telephony.
• C. IP telephony is not allowed to be modified.
• D. Only open-source software may modify IP telephony.

Answer: (B)

Authorization for IP telephony isn’t restricted to a single vendor; in real networks, several vendors may modify, control, and monitor IP telephony as long as they are authorized. This flexibility comes from the use of interoperable standards and interfaces that let different devices and management systems work together, so administrators can authorize multiple trusted vendors to handle various parts of the system (such as call control, security, and monitoring). The other statements aren’t correct because IP telephony modification isn’t limited to one company, it can be modified, and it isn’t restricted to open-source software—both proprietary and open-source tools are commonly used depending on the environment and policies.

Authorization for IP telephony isn’t restricted to a single vendor; in real networks, several vendors may modify, control, and monitor IP telephony as long as they are authorized. This flexibility comes from the use of interoperable standards and interfaces that let different devices and management systems work together, so administrators can authorize multiple trusted vendors to handle various parts of the system (such as call control, security, and monitoring). The other statements aren’t correct because IP telephony modification isn’t limited to one company, it can be modified, and it isn’t restricted to open-source software—both proprietary and open-source tools are commonly used depending on the environment and policies.